package com.lzl.test;

import org.apache.tomcat.util.codec.binary.Base64;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Arrays;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

/**
 * 3DES加密解密方式
 * @author Administrator
 *
 */
public class DES3 {

    private static final String KEY_ALGORITHM = "DESede";
    private static final String DEFAULT_CIPHER_ALGORITHM = "DESede/ECB/PKCS5Padding";// 默认的加密算法
//    private static final String DEFAULT_CIPHER_ALGORITHM = "DESede/ECB/ZeroPadding";// 默认的加密算法
//    private static final String DEFAULT_CIPHER_ALGORITHM = "DESede/ECB/NoPadding";// 默认的加密算法

    /**
     * DESede 加密操作
     *
     * @param content
     *            待加密内容
     * @param key
     *            加密密钥
     * @return 返回Base64转码后的加密数据
     */
    public static String encrypt(String content, String key) {
        try {
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
            // 创建密码器
            byte[] byteContent = content.getBytes("utf-8");
            cipher.init(Cipher.ENCRYPT_MODE, getSecretKey(key));
            // 初始化为加密模式的密码器
            byte[] result = cipher.doFinal(byteContent);// 加密
            return Base64.encodeBase64String(result);// 通过Base64转码返回
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return null;
    }

    /**
     * } } DESede 解密操作
     *
     * @param content
     * @param key
     * @return
     */
    public static String decrypt(String content, String key) {
        try {
            // 实例化
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM); // 使用密钥初始化，设置为解密模式
            cipher.init(Cipher.DECRYPT_MODE, getSecretKey(key)); // 执行操作
            byte[] result = cipher.doFinal(Base64.decodeBase64(content));
            return new String(result, "utf-8");
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return null;
    }

    /**
     }
     * 生成加密秘钥
     *
     * @return
     */ private static SecretKeySpec getSecretKey(final String key) {
        //返回生成指定算法密钥生成器的KeyGenerator 对象
        KeyGenerator kg = null; try { kg = KeyGenerator.getInstance(KEY_ALGORITHM);
            kg.init(new SecureRandom(key.getBytes()));
            //生成一个密钥
            SecretKey secretKey = kg.generateKey();
            return new SecretKeySpec(secretKey.getEncoded(), KEY_ALGORITHM);
            // 转换为DESede专用密钥
        } catch (NoSuchAlgorithmException ex) {
            ex.printStackTrace();
        } return null;
    }

    public static void main(String[] args) throws Exception {
//        SecretKeySpec s=getSecretKey("1111");
//        String ss=new String(s.getEncoded());
//        System.out.println(ss);
//        String content = "15354067010";
//        String key = "EXI19477204153US";
//        System.out.println("content:" + content);
//        String s1 = DES3.encrypt(content, key);
//        System.out.println("加密:" + s1);
//        System.out.println("解密:" + DES3.decrypt(s1, key));
        System.out.println(encrypt1("15354067010","EXI19477204153US"));
    }
    public static String encrypt1(String message, String key) throws Exception {
        final MessageDigest md = MessageDigest.getInstance("md5");
        final byte[] digestOfPassword = md.digest(key.getBytes("GB2312"));
        final byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
        for (int j = 0, k = 16; j < 8;) {
            keyBytes[k++] = keyBytes[j++];
        }

        final SecretKey keyz = new SecretKeySpec(keyBytes, "DESede");
        final IvParameterSpec iv = new IvParameterSpec(new byte[8]);
        final Cipher cipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, keyz, iv);

        final byte[] plainTextBytes = message.getBytes("GB2312");
        final byte[] cipherText = cipher.doFinal(plainTextBytes);
        final String encodedCipherText = new   sun.misc.BASE64Encoder().encode(cipherText);

        return encodedCipherText;
    }
}